Most common questions used to investigate
Is your oven too hot?
Is your pan the correct size?
Did you place your cake on a high shelf in your oven?
Did you open and close your oven door frequently?
Common conclusions
High heat can cause your cake to crack. Use a thermometer to make sure your oven temperature is correct.
A wrong sized pan can cause your cake to bake unevenly and crack. Use a pan that isn't too small, to ensure the cake cooks evenly.
In gas ovens higher shelves get hotter and may cause your cake to crack. Place your cake on the lower shelves of your oven.
Opening and closing your oven door can make the temperature in your oven fluctuate and cause your cake to crack. Try to minimize the times you open and close your oven.
Sorry, we were unable to find the reason your cake cracked.
References
https://food52.com/blog/15976-why-cakes-crack-how-to-prevent-it
https://www.goodhousekeeping.com/uk/food/a563309/how-to-stop-cake-cracking/
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